water circulation question

kiss...

i would offer a thought to "shutting off" the water flow through the heater core. water flowing through a heater core does provide some additional cooling of the engine water. that is why you can often turn the heater on in a car that is overheating and gain enough driving miles to get the car home or to a gas station. as old mopars were designed to have the water flowing through the heater core at all times, you might find the car running a little hotter if you block this flow. if your radiator is good, you probably won't notice any temperature rise. however, if you do, it may be as a result of you stopping water flowing through the heater core.